Pink eye spreads mainly through direct contact with infected secretions, contaminated surfaces, or respiratory droplets. The specific way you catch it depends on the type: viral, bacterial, allergic, or irritant. Not all pink eye is contagious, but the infectious forms spread easily and can survive on surfaces for hours.
Viral Pink Eye: The Most Common Type
Most cases of pink eye are caused by adenovirus, the same family of viruses responsible for many colds. You can pick it up by touching a surface where the virus has landed, then touching your eye. You can also catch it from respiratory droplets when someone nearby coughs or sneezes. Adenoviruses are particularly hardy. They resist many common disinfectants and remain infectious on surfaces and objects for hours, which is why outbreaks move quickly through schools, daycares, and offices.
Less commonly, the herpes simplex virus (the virus behind cold sores) and the chickenpox virus can also cause pink eye. These spread through direct contact with an active sore or blister, then transfer to the eye.
Symptoms of viral pink eye can appear anywhere from 12 hours to 12 days after exposure. That wide window means you might not connect the infection to the moment you picked it up. You’re contagious as long as your eyes are red and producing discharge, which often lasts one to two weeks.
Bacterial Pink Eye
Bacterial pink eye follows a similar playbook: you touch something contaminated and then touch your eye, or you come into direct contact with discharge from an infected person’s eye. Sharing towels, pillowcases, washcloths, or eye makeup are common ways the bacteria make the jump. The timeline is faster than viral cases. Symptoms typically show up 24 to 72 hours after exposure.
Bacterial pink eye tends to produce thicker, yellow-green discharge compared to the watery discharge of viral cases. It often starts in one eye and can spread to the other if you touch or rub your infected eye and then touch the healthy one.
Allergic and Irritant Pink Eye
Not all pink eye comes from an infection. Allergic conjunctivitis is your body’s reaction to pollen, dust mites, mold, pet dander, or certain cosmetics and medications. It usually affects both eyes at once and tends to cause intense itching along with redness and watering. This type is not contagious at all.
Irritants can trigger pink eye too. Exposure to smoke, chemical fumes, dust, or indoor air pollution can inflame the clear membrane covering your eye. A loose eyelash or other foreign body stuck under your eyelid does the same thing. Contact lenses worn too long or cleaned improperly are another frequent irritant. Again, none of these forms spread from person to person.
Contact Lenses and Eye Infections
Contact lens wearers face a higher risk of pink eye and other eye infections because of specific habits that let bacteria, fungi, or parasites build up. Sleeping in your lenses is one of the biggest risk factors. Other common mistakes include reusing or topping off old lens solution instead of replacing it fresh, not rubbing lenses during cleaning (even if the solution says “no rub”), and wearing disposable lenses past their intended lifespan.
Homemade saline solution is especially dangerous because it can harbor organisms that cause serious infections. Always use store-bought solution, replace your lens case at least three times a year, and give your eyes regular breaks from contacts. If you develop pink eye, stop wearing your lenses immediately and throw away any disposable lenses and cases you used while infected.
How Newborns Get Pink Eye
Newborns can develop pink eye during delivery if the mother carries certain bacteria or viruses, even if she has no symptoms at the time. Chlamydia and gonorrhea are the two most concerning causes, as both can be passed during childbirth and may lead to serious eye damage if untreated. Other bacteria that normally live in the vaginal canal, along with the herpes virus, can also infect a newborn’s eyes during birth. This is one reason hospitals routinely apply antibiotic ointment to newborns’ eyes shortly after delivery.
How to Avoid Spreading or Catching It
The single most effective step is handwashing. Wash with soap and water for at least 20 seconds, especially after touching your face or eyes, after contact with someone who has pink eye, and before and after applying any eye drops or ointment. If you don’t have access to soap and water, an alcohol-based hand sanitizer with at least 60% alcohol works as a backup. The core rule is simple: don’t touch your eyes with unwashed hands.
If you already have pink eye, keeping it from spreading takes some extra effort:
- Towels, pillowcases, and washcloths should be washed in hot water and detergent. Don’t share them with anyone.
- Eye discharge should be cleaned several times a day with a fresh, wet washcloth or cotton ball. Throw cotton balls away after each use.
- Eye drops should never be shared between your infected eye and your healthy eye. Use separate bottles.
- Makeup and brushes used near your eyes during the infection should be thrown out. Don’t share eye or face makeup with others.
- Eyeglasses and reusable lenses should be thoroughly cleaned according to your eye doctor’s instructions before you use them again.
Children with pink eye should stay home from school if they can’t avoid close contact with classmates. Adults should take the same approach with work when possible, returning once symptoms improve and any prescribed treatment is underway.